获取dataGrid 行

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using System.Windows.Controls; using System.Windows.Controls.Primitives; using System.Windows.Media;    namespace Splash.WPF {     public static class DataGridPlus     {         /// <summary>         /// 获取DataGrid控件单元格         /// </summary>         /// <param name="dataGrid">DataGrid控件</param>         /// <param name="rowIndex">单元格所在的行号</param>         /// <param name="columnIndex">单元格所在的列号</param>         /// <returns>指定的单元格</returns>         public static DataGridCell GetCell(this DataGrid dataGrid, int rowIndex, int columnIndex)                {             DataGridRow rowContainer = dataGrid.GetRow(rowIndex);             if (rowContainer != null)             {                 DataGridCellsPresenter presenter = GetVisualChild<DataGridCellsPresenter>(rowContainer);                 DataGridCell cell = (DataGridCell)presenter.ItemContainerGenerator.ContainerFromIndex(columnIndex);                 if (cell == null)                 {                     dataGrid.ScrollIntoView(rowContainer, dataGrid.Columns[columnIndex]);                     cell = (DataGridCell)presenter.ItemContainerGenerator.ContainerFromIndex(columnIndex);                 }                 return cell;             }             return null;         }            /// <summary>         /// 获取DataGrid的行         /// </summary>         /// <param name="dataGrid">DataGrid控件</param>         /// <param name="rowIndex">DataGrid行号</param>         /// <returns>指定的行号</returns>         public static DataGridRow GetRow(this DataGrid dataGrid, int rowIndex)                {             DataGridRow rowContainer = (DataGridRow)dataGrid.ItemContainerGenerator.ContainerFromIndex(rowIndex);             if (rowContainer == null)             {                 dataGrid.UpdateLayout();                 dataGrid.ScrollIntoView(dataGrid.Items[rowIndex]);                 rowContainer = (DataGridRow)dataGrid.ItemContainerGenerator.ContainerFromIndex(rowIndex);             }             return rowContainer;         }            /// <summary>         /// 获取父可视对象中第一个指定类型的子可视对象         /// </summary>         /// <typeparam name="T">可视对象类型</typeparam>         /// <param name="parent">父可视对象</param>         /// <returns>第一个指定类型的子可视对象</returns>         public static T GetVisualChild<T>(Visual parent) where T : Visual         {             T child = default(T);             int numVisuals = VisualTreeHelper.GetChildrenCount(parent);             for (int i = 0; i < numVisuals; i++)             {                 Visual v = (Visual)VisualTreeHelper.GetChild(parent, i);                 child = v as T;                 if (child == null)                 {                     child = GetVisualChild<T>(v);                 }                 if (child != null)                 {                     break;                 }             }             return child;         }     } }